Moss Bluff Lock And Spillway Reservoir Report

Last Updated: December 5, 2025

Located in Marion County, Florida, the Moss Bluff Lock and Spillway serves a primary purpose of navigation along the Oklawaha River.


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Summary

Completed in 1969, this earth dam stands at a height of 44 feet and spans 485 feet in length, with a storage capacity of 151,200 acre-feet. While primarily used for navigation, the structure also serves purposes such as fire protection, stock, and small fish pond management.

With a low hazard potential and a moderate risk assessment rating, the Moss Bluff Lock and Spillway is deemed to be in satisfactory condition, although not formally rated. The dam features an uncontrolled spillway and outlet gates, with a maximum discharge capacity of 3,420 cubic feet per second. Despite its age, the structure has not undergone any significant modifications in recent years and does not have associated locks. Water resource and climate enthusiasts may find this site to be a fascinating example of how infrastructure can support both human activities and environmental conservation efforts in the region.

Year Completed

1969

Dam Length

485

Dam Height

44

River Or Stream

OKLAWAHA RIVER

Primary Dam Type

Earth

Surface Area

476

Hydraulic Height

44

Nid Storage

151200

Structural Height

32

Outlet Gates

Uncontrolled

Hazard Potential

Low

Nid Height

44
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.